Protects the body from disease

Protects the body from disease

• A. Immune System
• B. Skeletal System
• C. Digestive System
• D. Circulatory System

Answer: (A)

The immune system protects the body from disease by recognizing and fighting invaders such as bacteria, viruses, and parasites. It works through barriers like skin and mucous membranes to keep pathogens out, plus internal defenses that respond to threats. Innate immunity acts quickly with general defenses like phagocytes and inflammation, while adaptive immunity builds targeted responses with T cells and B cells, producing antibodies and memory for quicker protection next time. Vaccines train this system to recognize specific pathogens without causing disease, strengthening future responses. Other body systems support health in related ways but aren’t the primary defense against infection. The skeletal system provides structure and protection for organs, the digestive system has barriers and gut flora that influence susceptibility, and the circulatory system helps transport immune cells and molecules, aiding defense but not by itself providing the core protection.

The immune system protects the body from disease by recognizing and fighting invaders such as bacteria, viruses, and parasites. It works through barriers like skin and mucous membranes to keep pathogens out, plus internal defenses that respond to threats. Innate immunity acts quickly with general defenses like phagocytes and inflammation, while adaptive immunity builds targeted responses with T cells and B cells, producing antibodies and memory for quicker protection next time. Vaccines train this system to recognize specific pathogens without causing disease, strengthening future responses.

Other body systems support health in related ways but aren’t the primary defense against infection. The skeletal system provides structure and protection for organs, the digestive system has barriers and gut flora that influence susceptibility, and the circulatory system helps transport immune cells and molecules, aiding defense but not by itself providing the core protection.